It is the mass of a body measured, when it is in translatory motion, by the application of external force other than gravity.
where a1 and a2 are accelerations of bodies of masses m1 and m2 respectively. Inertial balance is used to measure inertial mass of the body.
It is the mass of a body measured when it is not in motion under the effect of gravity. It is measured using a physical balance.
Mass is measured using a physical balance that is based on levers and used for measuring mass of small objects. Weight of a body is due to the gravitation pull, W = mg, where m the mass and g the gravitational constant. Spring balance is used for measuring weight [diameter of the physical balance to be given with their measuring parts identified and as understood in earlier classes or studies].
